Q: Which of the following acids is the strongest based on its $$K_a$$ value?

An acid with $$K_a = 1.0 \\times 10$$^{-2}$$

Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Chocolate chip cookie

Question 2

A sample of matter has a mass of 25.0 g and a volume of 5.00 mL. What is its density?

Accepted Answer

$$5.00 \ \mathrm{g/mL}$$

Question 3

Which of the following statements best describes a chemical change?

Accepted Answer

Iron rusting in the presence of oxygen

Question 4

How many protons, neutrons, and electrons are in a neutral atom of $$^{35}_{17}\mathrm{Cl}$$?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 5

Which of the following best describes the difference between a physical and a chemical property?

Accepted Answer

A chemical property describes how a substance reacts with other substances.

Question 6

Which of the following is the correct electron configuration for a neutral atom of sodium ($$\mathrm{Na}$$, atomic number 11)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^1$$

Question 7

A radioactive isotope has a half-life of 4 hours. How much of a 100 g sample remains after 12 hours?

Accepted Answer

$$12.5 \ \mathrm{g}$$

Question 8

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full outer electron shell.

Question 9

Which of the following is a correct balanced nuclear equation for the alpha decay of $$^{226}_{88}\mathrm{Ra}$$?

Accepted Answer

$$^{226}_{88}\mathrm{Ra} \$$rightarrow ^{222}$$_{86}\mathrm{Rn} $$+ ^{4}$$_{2}\mathrm{He}$$

Question 10

Which of the following molecules exhibits hydrogen bonding?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 11

A gas occupies a volume of $$2.0 \ \mathrm{L} at$$ $$1.0 \ \mathrm{atm}$$ and $$300 \ \mathrm{K}. $$What will the volume be at $$2.0 \ \mathrm{atm}$$ and $$300 \ \mathrm{K}$$, assuming the amount of gas remains constant?

Accepted Answer

$$1.0 \ \mathrm{L}$$

Question 12

Which of the following statements about strong electrolytes is correct?

Accepted Answer

They completely dissociate into ions in solution.

Question 13

Which of the following is the correct formula for the conjugate base of $$\mathrm{$$HCO_3$$^-}$$?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 14

Which of the following best describes the effect of increasing temperature on the solubility of a solid in water?

Accepted Answer

Solubility increases

Question 15

Which of the following is the correct equilibrium constant expression for the reaction: $$aA + bB \rightleftharpoons cC + dD$$?

Accepted Answer

$$K = \dfrac{[C]^c[D]^d}{[A]^a[B]^b}$$

Question 16

Which of the following acids is the strongest based on its $$K_a$$ value?

Accepted Answer

An acid with $$K_a = 1.0 \times 10$$^{-2}$$

Question 17

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

It lowers the activation energy, increasing the reaction rate.

Question 18

Which of the following is a property of oils but not fats?

Accepted Answer

Usually liquid at room temperature

Question 19

Which of the following best describes the effect of pressure on the solubility of gases in liquids?

Accepted Answer

Increasing pressure increases solubility

Question 20

A solution is prepared by dissolving $$10.0 \ \mathrm{g} of $$NaCl in enough water to make $$500.0 \ \mathrm{mL} of $$solution. What is the molarity of the solution? ($$\mathrm{NaCl}$$ molar mass = $$58.44 \ \mathrm{g/mol})$$

Accepted Answer

$$0.342 \ \mathrm{M}$$

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